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 April 3rd, 2014, 04:48 PM #1 Newbie   Joined: Apr 2014 From: Auckland Posts: 3 Thanks: 0 Functions If F(x)=2x+2 Simplify when a. f(-x) and b. f(x^2) Im just unsure if i should be substituting in a '-x' in to the equation or i have to multiply the whole equation against the negative sign. Same goes for f(x^2). Can someone please push me in the right direction? Many thanks!
 April 3rd, 2014, 06:44 PM #2 Global Moderator   Joined: Dec 2006 Posts: 18,963 Thanks: 1606 I take it you meant f(x) rather than F(x). (a). f(-x) = 2(-x) + 2 = -2x + 2 (b). f(xÂ²) = 2(xÂ²) + 2 = 2xÂ² + 2 Thanks from AU19852
 April 4th, 2014, 02:19 AM #3 Senior Member   Joined: Mar 2014 Posts: 112 Thanks: 8 $\displaystyle f(-x)\,=\,-2x\,+\,2$ $\displaystyle f(x^2)\,=\,2x^2\,+\,2$ Thanks from AU19852

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